An engine working on air standard Otto cycle is supplied with air at 0.1 MPa and 35°C. The compression ratio is 8. The heat supplied is 500 kJ/kg. Property data for air: c, = 1.005kJ/kgK, c,0.718kJ/kgK,R = 0.287 kJ/kgK. The maximum temperature (in K) of the cycle is (correct to one decimal place).

An engine working on air standard Otto cycle is supplied with air at 0.1 MPa and 35°C. The compression ratio is 8. The heat supplied is 500 kJ/kg. Property data for air: c, = 1.005kJ/kgK, c,0.718kJ/kgK,R = 0.287 kJ/kgK. The maximum temperature (in K) of the cycle is (correct to one decimal place).

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

Air enters the compressor of a cold air-standard Brayton cycle with regeneration at 90 kPa, 293 K, with a mass flow rate of 6 kg/s. The compressor pressure ratio is 10, and the turbine inlet temperature is 1300 K. The turbine and the compressor each have isentropic efficiencies of 85% and the regenerator effectiveness is 85%. Assume constant specific heats, take k = 1.4 and CP = 1.005 kJ/kgK. 3.2.1 Represent the cycle on a T – s diagram. Calculate: 3.2.2 the thermal efficiency of the cycle, 3.2.3 the back work ratio, and 3.2.4 the net power developed, in kW.
Calculate the efficiency of an Diesel cycle assuming Cold Air-Standard Analysis operating in air (k= 1.4) with a compression ratio of 20 and a cutoff ratio of 1.7? (Enter your answer as a percent to the nearest 1/10th)
The compression ratio of an air-standard Otto cycle is 7.5. P1 = 85 kPa and T1 = 32 Celsius at the startof compression. The highest temperature in the cycle is 960 K, and the mass of air is 3 g. determine the: (a) the heat rejection, in kJ, (b) the network, in kJ (c) the thermal efficiency, and the (d) mean effective pressure, in kPa. Show complete solution.
At the beginning of the compression process of an air-standard Otto cycle, P1=1bar, T1=290K, V1=400cm3. The maximum temperature in the cycle is 2200K and the compression ratio is 8.00. Determine the (a) heat addition, in kJ, (b) ????, in kJ, (c) thermal efficiency, and (d) mean effective pressure, in kPa. Consider the cycle as a model of the processes in each cylinder of a spark-ignition engine. Determine the (e) net power output, in kW, if the engine has four cylinders and the cycle is repeated 1200 times per minute in each cylinder. Note that the specific heats are NOT constant.
1. In an ideal air-standard Otto cycle, the initial conditions are 1 bar and 300 K. The compression ratio is 12:1, and the maximum cycle temperature is 2500 K. Assuming cp = 1.004 kJ/kg-K & k = 1.4, find: (a) show the cycle in both P-v and T-s diagrams. Clearly label all states and energy transfers. (b) temperature at the end of compression, T₂ in K. (c) heat added during the combustion process in kJ/kg. (d) thermal efficiency of the cycle. (e) net work output from the cycle in kJ/kg.
Air enters the compressor of an ideal air-standard Brayton cycle at 110 kPa, 289 K, with a volumetric flow rate of 5 m3/s. The compressor pressure ratio is 12:1. The turbine inlet temperature is 1567 K. Take the gas constant as 289 J/kg.K and Specific heat at constant pressure and constant volume for air as 1.004 kJ/kg K and 0.708 kJ/kg K respectively. Calculate the net power developed to two decimal places and include the correct SI unit symbol.
An air-standard Diesel cycle has a maximum temperature of 1800 K. At the beginning of compression, p1 = 95 kPa and Tq = 300 K. The mass of airis 12 g. For a compression ratio of 15, determine (a) the net work of the cycle, in kJ. (b) the thermal efficiency. (c) the mean effective pressure, in kPa.
An air-standard Diesel cycle has a maximum temperature of 1800 K. At the beginning of compression, pq =95 kPa and T1 = 300 K. The mass of air is 12 g. For a compression ratio of 15, determine (a) the net work of the cycle, in KkJ. (b) the thermal efficiency. (c) the mean effective pressure, in kPa.
Q1/ An air-standard Otto cycle has a compression ratio of 8.5. At the beginning of compression, p;=100 kPa and T,=310 K. The heat addition per unit mass of air is 1440 kJ/kg. Determine (a) the net work, in kJ per kg of air. (b) the thermal efficiency of the cycle. () the mean effective pressure, in kPa. (d) the maximum temperature in the cycle, in K.
An Otto cycle with the air-standard assumptions (cv=0.717 kJ/kg.K and cp/cv=1.4) has a compression ratio of 10. Before the isentropic compression process, the air is at 140 kPa, 15°C, and 590 cm3. The heat transfer to the air per cycle is 1200 kJ/kg. The angular speed of the crankshaft for the four-stroke engine is 2400 revolutions per minute. Determine(a) the thermal (first law) efficiency,(b) the second law efficiency,(c) the net specific power output of the cycle (in kJ/kg)(d) the mean effective pressure (MEP),(e) the horse power (hp) of the engineNote: You must draw P-V and T-s charts and mark processes to have a score
1. An ideal air-standard diesel cycle with inlet conditions: 21.11˚C and 14.7 psia, 700 Btu/lbm heat input, and a compression ratio of 15. Find P2, T2, T3, V3, P4, T4, and the efficiency of the cycle. Take Note: Assume air standard values for R and k Cp = kR/k-1 Cv = R/k-1 a. Find the value of P2. (in psi or lb/in^2) b. Find the value of T2. (in Rankine) c. Find the value of T3. (in Rankine) d. Find the value of V3. (in ft^3/lbm) e. Find the value of P4. (in psi or lb/in^2) f. Find the value of T4. (in Rankine) g. Find the value of efficiency of the cycle. (ex. 100-%)
The pressure and temperature at the beginning of compression of an air-standard Diesel cycle are 90 kPa and 300 K, respectively. At the end of the heat addition, the pressure is 6821 kPa and the temperature is 1950 K. Determine: (a) the compression ratio, r. (b) the cutoff ratio, rc. (c) the thermal efficiency of the cycle, ?th (%). (d) the mean effective pressure, mep (kPa).